deadbolt with occupancy indicator

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The replacement for the D871 is the D271.  None of the parts are backwards compatible. D271 description:Thumbturn x Occupancy Indicator Deadbolt thrown or retracted by turn unit only. ...
The Falcon D400 and D800 series (including the D871) were discontinued in 2008.
The Falcon MA mortise lock is available with an occupancy indicator on the following functions: MA301, MA311, MA321, MA371, MA431, MA441(inside of door only), MA451, MA541, MA57...
Related solution: Is the MA indicator available separately? 
The ND40 does not have this option.  You will need to look at a mortise lock, L9496, or a deadbolt such as the B571.
Indicator not extended Indicator extended
The indicator on a cylindrical hotel lock is a small pin that projects outward from the face of the cylinder plug (Figure 1) when the inside push button is depressed.  When this pin is pr...
Both the Schlage B571 and Falcon D271 are occupancy indicator deadbolts that read "IN USE" and "VACANT".  The B571 is shown below but the indicator will be identical to the D271 (see Figu...
Deadbolt thrown or retracted by turn unit only. Occupancy indicator on outside (reads either in use or vacant with color coding). Bolt automatically deadlocks when fully thrown. Emergency key suppl...
Hotel/motel lock - Deadbolt thrown or retracted by emergency master key in upper cylinder from outside or thumbturn inside. Deadlatch retracted by key in outside knob, except when the lock is in ...
Door bolt occupancy indicator - Deadbolt thrown or retracted by thumbturn inside. Outside indicator displays “In use” or “Vacant”.